Mercer County

Mercer County scores in the 96th percentile nationally out of 1,000 counties analyzed, with an overall score of 77 and an appreciation score of 84, against a median home price of $173,161 that rose 8.2% year-over-year. The affordability index sits at 93, which is high, meaning buyers can access this market without stretching. What the data does not show is a cash-flow score, a cap rate, or a gross rent multiplier, because no rental rate data was provided for this county. That absence is itself meaningful: investors relying on this analysis should treat Mercer as an appreciation and affordability play until rent comps from comparable properties are underwritten independently.

The profile here fits an appreciation buyer or a patient buy-and-hold investor willing to accept below-average near-term income in exchange for price growth and a low entry point. At $173,161, the purchase price is accessible, and 8.2% annual price appreciation is real, not marginal. An affordability index of 93 suggests the local buyer pool can support prices at this level, which reduces the downside risk of a sharp correction driven by affordability stress. What this market does not suit is a cash-flow-first investor running tight debt service coverage ratios. Without rent data to confirm yield, there is no basis to project positive leverage, and the carry costs outlined below make that gap worse before it gets better.

The tax and insurance picture in Mercer is a genuine underwriting problem, not a footnote. At a 2.27% state-average effective property tax rate, Illinois is one of the highest-tax environments in the country, and that number deserves its own line on every underwrite before you model anything else. On a $173,161 asset, that translates to $3,931 in annual property tax, $468 in estimated annual insurance, and a combined monthly carry of $367 just for tax and insurance, before debt service, maintenance, vacancy, or management. To put that in context: if this property rents for $900 per month, tax and insurance alone consume 41% of gross rent before the mortgage is touched. The 2.27% figure is a state-average estimate per the Tax Foundation's 2024 data, and the actual county or township rate in Mercer may differ, so pulling the local assessor's effective rate for any specific parcel is non-negotiable before closing. If the rate is meaningfully above 2.27% at the parcel level, walk carefully. If it comes in below, that is a real improvement to the cash-flow story.

Mercer County is a rural Illinois market with a population of 15,692. No economic anchor data was provided, so this analysis will not speculate about employers or demand drivers. What a population of that size does signal is limited tenant pool depth, which matters when a unit turns. Vacancy duration in a small rural county can run longer than a metro market, and that risk compounds the already-thin cash flow margin created by the tax burden. Concentration risk is real here: a single-asset owner in a 15,000-person county is exposed to local economic shifts in a way that a landlord operating in a larger MSA is not. An investor who already holds rural Illinois exposure should model that concentration carefully before adding Mercer to the same portfolio.

Against its neighbors, Mercer holds its own on overall score but not on every metric that matters. McDonough County, IL carries a median home price of just $92,986 and a rent-to-price ratio of 0.121, which is well into cash-flow territory, nearly 44% higher yield than Saint Clair County's 0.084 ratio on a $173,515 asset. An investor whose primary objective is monthly income should look hard at McDonough before Mercer, because the price point is lower, the yield ratio is materially better, and the overall score of 76 is only one point behind Mercer's 77. Iroquois County and Bureau County both score 78 overall and come in at $149,561 and $143,471 respectively, offering lower entry prices than Mercer, though no rent data is available for either to compare yield. Saint Clair County is nearly price-equivalent to Mercer at $173,515 and scores identically at 77, but its rent-to-price ratio of 0.084 provides at least a known yield number to underwrite against. The case for choosing Mercer over these neighbors rests on its superior appreciation score of 84 and its 8.2% year-over-year price growth. If price appreciation is the strategy and you are comfortable carrying the Illinois tax burden while rents are validated through local comps, Mercer earns a look. If cash flow is the mandate, McDonough is the more defensible choice at current data.